Reversible center-pinion for time-keepers



(ModeL) G. E. MASON. REVERSIBLE CENTER PINION EOE TIME KEEPERS. No. 288,087. Patented Nov. 6, 1883.

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UNITED STATES PATENT OFFICE.

CHARLES E. MASON, OF COLUMBUS, OHIO.

REVERSIBLE CENTER-PINION FOR TIME-KEEPERS.

SPECIFICATION forming part of Letters Patent No. 288,087, dated November 6, 1883.

4 Application filed July 17, 1883. (ModeL) To all whom it may concern:

Be it known that I, CHAS. E. MASON, a citizen of the United States, residing at Golumbus, in the county of Franklin and State of Ohio, have invented certain new and use ful Improvements in Reversible Center-Pinions for TimeKeepers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 of the drawings is arepresentation of this invention, and in it the toothed wheel is shown in section, to show the position of the other parts. Fig. 2 is a side view without the wheel. Fig. 3 is a top view, to show the slotted shoulder. Fig. 4 is a bottom view of the wheel. Fig. 5 is a section taken through where the broken line is shown on Fig. 4. at y y, and Fig. 6 is a section taken at m m.

This invention has relation to reversible center-pinions' for time-keepers and other machines wherein such devices may be needed; and it consists in the construction and novel arrangement of parts, as hereinafter set forth, and pointed out in the appended claim.

In the accompanying drawings, the letter A designates a toothed wheel. or pinion having a hollow chamber, b, in which is located a spring, 0. The cylindrical chamber b is carried nearly through the body of the pinion, an internal projection or segment-shaped flange-lug, D, being formed at its end, occupying about one-third of its circumference. In this manner a flat and straight lip is formed at the end of the chamber, projecting into the same. At this end, therefore, the cylindrical wall occupies about two-thirds of the opening, the remaining third being occupied by the inwardly-projecting segment lip D. The shaft or stem E of the pinion is provided with a lower shoulder or seat, G, and with an upper shoulder or collar, H. On this shoulder, projection, or collar H an oblique, depressed, or cutaway bearing, k, is formed, having a bevelwall, 1;. Between the shoulders G and H is formed, around the stem, an annular recess, Z, in which is seated a spiral spring, O, one end of which bears against the upper shoulder, H, while the lower coil, which is somewhat enlarged, as shown, is fitted into an annular recess, 7", in the lower portion of the inner wall of the pinion. The tension of the spring is therefore between the shoulder H of the shaft and the recess-bearing r in the toothed wheel.

The wheel A is drawn upon its shaft to its shoulder or seat whenever the oblique bearing is is brought opposite to the inwardly-projecting lip D of the toothed wheel. \Vhen the wheel is revolved in one direction, the lip D will slide into the oblique bearing and lock the wheel firmly to the shaft. \Vhen revolved in the opposite direction, the lip D will be raised by the oblique bearing it entirely out of the same, thus allowing the wheel to revolve freely on the shaft in this direction.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1s-

The reversible center-pinion consisting of the shaft or stem having the shoulder or collar formed with an oblique bearing, 7;, the annular chamber containing a spring, and the toothed wheel formed with a central circular chamber having at one end a segment-lip, D, projecting inwardly. and at the other an annular recess engaging an enlarged coil of the spring, substantially as specified.

In testimony whereof I aflix my signature in presence of two witnesses.

CHAS. E. MASON.

IVitnesses P. H. WHEELER, Lno AnLnY. 

